# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
# pylint: disable=C,R,W
from superset.db_engine_specs.base import BaseEngineSpec


class KylinEngineSpec(BaseEngineSpec):
    """Dialect for Apache Kylin"""

    engine = 'kylin'

    time_grain_functions = {
        None: '{col}',
        'PT1S': 'CAST(FLOOR(CAST({col} AS TIMESTAMP) TO SECOND) AS TIMESTAMP)',
        'PT1M': 'CAST(FLOOR(CAST({col} AS TIMESTAMP) TO MINUTE) AS TIMESTAMP)',
        'PT1H': 'CAST(FLOOR(CAST({col} AS TIMESTAMP) TO HOUR) AS TIMESTAMP)',
        'P1D': 'CAST(FLOOR(CAST({col} AS TIMESTAMP) TO DAY) AS DATE)',
        'P1W': 'CAST(TIMESTAMPADD(WEEK, WEEK(CAST({col} AS DATE)) - 1, \
               FLOOR(CAST({col} AS TIMESTAMP) TO YEAR)) AS DATE)',
        'P1M': 'CAST(FLOOR(CAST({col} AS TIMESTAMP) TO MONTH) AS DATE)',
        'P0.25Y': 'CAST(TIMESTAMPADD(QUARTER, QUARTER(CAST({col} AS DATE)) - 1, \
                  FLOOR(CAST({col} AS TIMESTAMP) TO YEAR)) AS DATE)',
        'P1Y': 'CAST(FLOOR(CAST({col} AS TIMESTAMP) TO YEAR) AS DATE)',
    }

    @classmethod
    def convert_dttm(cls, target_type, dttm):
        tt = target_type.upper()
        if tt == 'DATE':
            return "CAST('{}' AS DATE)".format(dttm.isoformat()[:10])
        if tt == 'TIMESTAMP':
            return "CAST('{}' AS TIMESTAMP)".format(
                dttm.strftime('%Y-%m-%d %H:%M:%S'))
        return "'{}'".format(dttm.strftime('%Y-%m-%d %H:%M:%S'))
